Researchers from the Mass General Brigham healthcare system in the US have developed an AI tool to identify long Covid, finding that 22.8% of the population exhibits symptoms. Analyzing data from nearly 300,000 patients across 14 hospitals, the tool provides a more accurate estimate than previous studies, which suggested a rate of just 7%. This AI approach helps clinicians recognize more cases, potentially reflecting the true long-term impact of the pandemic. The researchers aim to share their algorithm with healthcare providers globally, despite some data limitations noted in the study.